The mark consists of Capital letter "P", in which the left hand vertical segment of the "P" is in the form of three, vertically stacked saw teeth; the upper two saw teeth have horizontal segments thereof on the bottom. The part of the vertical segment of the "P" below the curved part of the "P" is tapered to a point at the bottom of the vertical segment. The curved part of the "P" encloses a space having a saw tooth point at the lower left corner.